How to use the format function in formatted strings-Python Tutorial-php.cn

How to use the format function in formatted strings

高洛峰

Release： 2017-03-23 15:00:51

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Format

## 1. Grammar

Replace %

by {} and: 2. Example

name = "bigberg"
age = 18
msg1="my name is {},and my age is {}.".format(name,age)
msg2="my name is {0},and my age is {1}.".format(name,age)
msg3="my name is {_name},and my age is {_age}.".format(_name=name,_age=age)
msg4="my name is {1},and my age is {0},and my brother's age is {0}.".format(age,name)
print(msg1)
print(msg2)
print(msg3)
print(msg4)
#输出
my name is bigberg,and my age is 18.
my name is bigberg,and my age is 18.
my name is bigberg,and my age is 18.
my name is bigberg,and my age is 18,and my brother's age is 18.

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　String The format function can accept unlimited parameters, the position can be not in order, it can be omitted or used multiple times, but 2.6 cannot be empty{}, 2.7 You can later.

3. Subscript to get the element

info = ["bigberg",18]
msg='{0[0]},{0[1]}'.format(info)
print(msg)
#输出
bigberg,18

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4. FormatQualifier

The syntax is {：}

1. Padding and alignment

Filling and alignment are often used together

^, <, > are centered, left-aligned, and right-aligned respectively, followed by width.

: The padding character after can only be one character. If not specified, it will be filled with spaces by default.

number = 234
print('{:>8}'.format(number))
print('{:*>8}'.format(number))
#输出
     234
*****234

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2. Precision and type f

num = 123.23423
print('{:.2f}'.format(num))
#输出
123.23

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Where. 2 represents the precision of length 2, f represents

float Type

3. Base

b, d, o, x represent binary, decimal, octal and hexadecimal respectively

num = 25
print('{:b}'.format(num))
print('{:d}'.format(num))
print('{:o}'.format(num))
print('{:x}'.format(num))
#输出
11001
25
31
19

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